Development of a flood water level estimation method using satellite images and a digital elevation model for the Mekong floodplain
Development of a flood water level estimation method using satellite images and a digital elevation model for the Mekong floodplain
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DOI：
10.1080/02626667.2019.1578463
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发表时间：
2019-01
影响因子：
3.5
通讯作者：
Kenji Tanaka;Y. Fujihara;Keisuke Hoshikawa;H. Fujii
中科院分区：
文献类型：
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作者：
Kenji Tanaka;Y. Fujihara;Keisuke Hoshikawa;H. Fujii
摘要 我们开发了一种仅使用卫星图像和 DEM 的洪水水位估算方法。该方法包括三个步骤：（1）区分洪水区域并识别每个洪水区域的丛集，（2）使用缓冲技术提取所识别的洪水区域的边缘，以及（3）执行空间插值以将提取的高程转换为洪水水位。我们将估计的洪水水位与观测到的水位进行了比较。使用 RADARSAT 在河流和洪泛区点的 RMSE 分别为 1.99 和 1.30 m，而使用 MODIS 在河流和洪泛区点的 RMSE 分别为 4.33 和 1.33 m。鉴于大多数误差归因于 DEM，该方法表现出良好的性能。此外，该方法还再现了洪水期间的水流方向和洪水水位变化。因此，我们证明即使无法获得地面观测数据，也可以了解洪水淹没的特征。
ABSTRACT We have developed a flood water level estimation method that only employs satellite images and a DEM. The method involves three steps: (1) discriminating flood areas and identifying clumps of each flood area, (2) extracting the edges of the identified flood area using a buffering technique, and (3) performing spatial interpolation to transform the extracted elevation to flood water levels. We compared the estimated flood water levels with the observed ones. The RMSE using the RADARSAT was 1.99 and 1.30 m at river and floodplain points, respectively, whereas the RMSE using the MODIS was 4.33 and 1.33 m at the river and floodplain points, respectively. Given that most errors are attributed to the DEM, the method exhibited good performance. Furthermore, the method reproduced the flow directions and flood water level changes during the flooding period. Thus, we demonstrated that the characteristics of flood inundation can be understood even when ground observation data cannot be obtained.